app-layer-detect-proto.h File Reference

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Typedefs
typedef struct AppLayerProtoDetectThreadCtx_	AppLayerProtoDetectThreadCtx
typedef AppProto(*	ProbingParserFPtr) (Flow *f, uint8_t dir, uint8_t *input, uint32_t input_len, uint8_t *rdir)

Functions
AppProto	AppLayerProtoDetectGetProto (AppLayerProtoDetectThreadCtx *tctx, Flow *f, uint8_t *buf, uint32_t buflen, uint8_t ipproto, uint8_t direction, bool *reverse_flow)
	Returns the app layer protocol given a buffer. More...
int	AppLayerProtoDetectPrepareState (void)
	Prepares the internal state for protocol detection. This needs to be called once all the patterns and probing parser ports have been registered. More...
void	AppLayerProtoDetectPPRegister (uint8_t ipproto, const char *portstr, AppProto alproto, uint16_t min_depth, uint16_t max_depth, uint8_t direction, ProbingParserFPtr ProbingParser1, ProbingParserFPtr ProbingParser2)
	register parser at a port More...
int	AppLayerProtoDetectPPParseConfPorts (const char *ipproto_name, uint8_t ipproto, const char *alproto_name, AppProto alproto, uint16_t min_depth, uint16_t max_depth, ProbingParserFPtr ProbingParserTs, ProbingParserFPtr ProbingParserTc)
int	AppLayerProtoDetectPMRegisterPatternCS (uint8_t ipproto, AppProto alproto, const char *pattern, uint16_t depth, uint16_t offset, uint8_t direction)
	Registers a case-sensitive pattern for protocol detection. More...
int	AppLayerProtoDetectPMRegisterPatternCSwPP (uint8_t ipproto, AppProto alproto, const char *pattern, uint16_t depth, uint16_t offset, uint8_t direction, ProbingParserFPtr PPFunc, uint16_t pp_min_depth, uint16_t pp_max_depth)
int	AppLayerProtoDetectPMRegisterPatternCI (uint8_t ipproto, AppProto alproto, const char *pattern, uint16_t depth, uint16_t offset, uint8_t direction)
	Registers a case-insensitive pattern for protocol detection. More...
int	AppLayerProtoDetectSetup (void)
	The first function to be called. This initializes a global protocol detection context. More...
void	AppLayerProtoDetectReset (Flow *)
	Reset proto detect for flow. More...
void	AppLayerRequestProtocolChange (Flow *f, uint16_t dp, AppProto expect_proto)
	request applayer to wrap up this protocol and rerun protocol detection. More...
void	AppLayerRequestProtocolTLSUpgrade (Flow *f)
	request applayer to wrap up this protocol and rerun protocol detection with expectation of TLS. Used by STARTTLS. More...
int	AppLayerProtoDetectDeSetup (void)
	Cleans up the app layer protocol detection phase. More...
void	AppLayerProtoDetectRegisterProtocol (AppProto alproto, const char *alproto_name)
	Registers a protocol for protocol detection phase. More...
int	AppLayerProtoDetectConfProtoDetectionEnabled (const char *ipproto, const char *alproto)
	Given a protocol name, checks if proto detection is enabled in the conf file. More...
AppLayerProtoDetectThreadCtx *	AppLayerProtoDetectGetCtxThread (void)
	Inits and returns an app layer protocol detection thread context. More...
void	AppLayerProtoDetectDestroyCtxThread (AppLayerProtoDetectThreadCtx *tctx)
	Destroys the app layer protocol detection thread context. More...
void	AppLayerProtoDetectSupportedIpprotos (AppProto alproto, uint8_t *ipprotos)
AppProto	AppLayerProtoDetectGetProtoByName (const char *alproto_name)
const char *	AppLayerProtoDetectGetProtoName (AppProto alproto)
void	AppLayerProtoDetectSupportedAppProtocols (AppProto *alprotos)
void	AppLayerRegisterExpectationProto (uint8_t proto, AppProto alproto)
void	AppLayerProtoDetectUnittestCtxBackup (void)
	Backs up the internal context used by the app layer proto detection module. More...
void	AppLayerProtoDetectUnittestCtxRestore (void)
	Restores back the internal context used by the app layer proto detection module, that was previously backed up by calling AppLayerProtoDetectUnittestCtxBackup(). More...
void	AppLayerProtoDetectUnittestsRegister (void)
	Register unittests for app layer proto detection module. More...

Detailed Description

Author

Victor Julien victo.nosp@m.r@in.nosp@m.linia.nosp@m.c.ne.nosp@m.t

Anoop Saldanha anoop.nosp@m.sald.nosp@m.anha@.nosp@m.gmai.nosp@m.l.com

Definition in file app-layer-detect-proto.h.

Typedef Documentation

typedef struct AppLayerProtoDetectThreadCtx_ AppLayerProtoDetectThreadCtx

Definition at line 28 of file app-layer-detect-proto.h.

typedef AppProto(* ProbingParserFPtr) (Flow *f, uint8_t dir, uint8_t *input, uint32_t input_len, uint8_t *rdir)

Definition at line 30 of file app-layer-detect-proto.h.

Function Documentation

int AppLayerProtoDetectConfProtoDetectionEnabled	(	const char *	ipproto,
		const char *	alproto
	)

Given a protocol name, checks if proto detection is enabled in the conf file.

Parameters

alproto

Name of the app layer protocol.

Return values

1	If enabled.
0	If disabled.

Definition at line 1883 of file app-layer-detect-proto.c.

References BUG_ON, ConfGetNode(), ConfValIsFalse(), ConfValIsTrue(), RunmodeIsUnittests(), SC_ERR_FATAL, SCEnter, SCLogDebug, SCLogError, SCReturnInt, and ConfNode_::val.

Referenced by AppLayerParserRegisterProtocolParsers(), HTPFreeConfig(), RegisterDCERPCParsers(), RegisterDCERPCUDPParsers(), RegisterDNP3Parsers(), RegisterENIPTCPParsers(), RegisterENIPUDPParsers(), RegisterFTPParsers(), RegisterHTPParsers(), RegisterModbusParsers(), RegisterNFSTCPParsers(), RegisterNFSUDPParsers(), RegisterSMBParsers(), RegisterSMTPParsers(), RegisterSSHParsers(), RegisterSSLParsers(), RegisterTemplateParsers(), and RegisterTFTPParsers().

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int AppLayerProtoDetectDeSetup

(

void

)

Cleans up the app layer protocol detection phase.

Todo:

incomplete. Need more work.

Definition at line 1789 of file app-layer-detect-proto.c.

References AppLayerProtoDetectCtx_::ctx_ipp, AppLayerProtoDetectCtxIpproto_::ctx_pm, AppLayerProtoDetectCtx_::ctx_pp, MpmTableElmt_::DestroyCtx, FLOW_PROTO_DEFAULT, AppLayerProtoDetectPMCtx_::map, AppLayerProtoDetectPMCtx_::max_sig_id, AppLayerProtoDetectPMCtx_::mpm_ctx, mpm_table, MpmCtx_::mpm_type, PatIntId, SCEnter, SCFree, SCReturnInt, AppLayerProtoDetectCtx_::spm_global_thread_ctx, and SpmDestroyGlobalThreadCtx().

Referenced by AppLayerDeSetup(), and AppLayerProtoDetectUnittestCtxRestore().

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void AppLayerProtoDetectDestroyCtxThread

(

AppLayerProtoDetectThreadCtx *

tctx

)

Destroys the app layer protocol detection thread context.

Parameters

tctx	Pointer to the app layer protocol detection thread context.

Definition at line 2005 of file app-layer-detect-proto.c.

References AppLayerProtoDetectCtx_::ctx_ipp, AppLayerProtoDetectCtxIpproto_::ctx_pm, MpmTableElmt_::DestroyThreadCtx, FLOW_PROTO_DEFAULT, AppLayerProtoDetectPMCtx_::mpm_ctx, mpm_table, AppLayerProtoDetectThreadCtx_::mpm_tctx, MpmCtx_::mpm_type, AppLayerProtoDetectThreadCtx_::pmq, PmqFree(), SCEnter, SCFree, SCReturn, AppLayerProtoDetectThreadCtx_::spm_thread_ctx, and SpmDestroyThreadCtx().

Referenced by AppLayerDestroyCtxThread(), AppLayerProtoDetectGetCtxThread(), and AppLayerProtoDetectUnittestCtxRestore().

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AppLayerProtoDetectThreadCtx* AppLayerProtoDetectGetCtxThread

(

void

)

Inits and returns an app layer protocol detection thread context.

Parameters

ctx	Pointer to the app layer protocol detection context.

Return values

Pointer

to the thread context, on success; NULL, on failure.

Definition at line 1951 of file app-layer-detect-proto.c.

References AppLayerProtoDetectDestroyCtxThread(), AppLayerProtoDetectCtx_::ctx_ipp, AppLayerProtoDetectCtxIpproto_::ctx_pm, FLOW_PROTO_DEFAULT, MpmTableElmt_::InitThreadCtx, AppLayerProtoDetectPMCtx_::max_pat_id, AppLayerProtoDetectPMCtx_::mpm_ctx, mpm_table, AppLayerProtoDetectThreadCtx_::mpm_tctx, MpmCtx_::mpm_type, PatIntId, AppLayerProtoDetectThreadCtx_::pmq, PmqSetup(), SCEnter, SCMalloc, SCReturnPtr, AppLayerProtoDetectCtx_::spm_global_thread_ctx, AppLayerProtoDetectThreadCtx_::spm_thread_ctx, and SpmMakeThreadCtx().

Referenced by AppLayerGetCtxThread(), and AppLayerProtoDetectUnittestCtxRestore().

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AppProto AppLayerProtoDetectGetProto	(	AppLayerProtoDetectThreadCtx *	tctx,
		Flow *	f,
		uint8_t *	buf,
		uint32_t	buflen,
		uint8_t	ipproto,
		uint8_t	direction,
		bool *	reverse_flow
	)

Returns the app layer protocol given a buffer.

Parameters

	tctx	Pointer to the app layer protocol detection thread context.
	f	Pointer to the flow.
	buf	The buffer to be inspected.
	buflen	The length of the above buffer.
	ipproto	The ip protocol.
	direction	The direction bitfield - STREAM_TOSERVER/STREAM_TOCLIENT.
[out]	reverse_flow	true if flow is detected to be reversed

Return values

The	app layer protocol.

Definition at line 1484 of file app-layer-detect-proto.c.

References AppLayerProtoDetectProbingParserElement_::alproto, ALPROTO_DCERPC, ALPROTO_MAX, ALPROTO_UNKNOWN, FLOW_IS_PE_DONE, FLOW_IS_PM_DONE, FLOW_IS_PP_DONE, AppLayerProtoDetectProbingParser_::next, SCEnter, SCLogDebug, SCReturn, SCReturnUInt, and STREAM_TOCLIENT.

Referenced by AppLayerHandleUdp(), and AppLayerIncTxCounter().

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AppProto AppLayerProtoDetectGetProtoByName

(

const char *

alproto_name

)

Definition at line 2042 of file app-layer-detect-proto.c.

References ALPROTO_MAX, AppLayerProtoDetectCtx_::alproto_names, ALPROTO_UNKNOWN, SCEnter, SCMemcmp, and SCReturnCT.

Referenced by AppLayerGetProtoByName().

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const char* AppLayerProtoDetectGetProtoName

(

AppProto

alproto

)

Definition at line 2059 of file app-layer-detect-proto.c.

References AppLayerProtoDetectProbingParserElement_::alproto, and AppLayerProtoDetectCtx_::alproto_names.

Referenced by AppLayerGetProtoName().

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int AppLayerProtoDetectPMRegisterPatternCI	(	uint8_t	ipproto,
		AppProto	alproto,
		const char *	pattern,
		uint16_t	depth,
		uint16_t	offset,
		uint8_t	direction
	)

Registers a case-insensitive pattern for protocol detection.

Definition at line 1743 of file app-layer-detect-proto.c.

References SCEnter, and SCReturnInt.

Referenced by AppLayerHtpPrintStats(), and SMTPStateAlloc().

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int AppLayerProtoDetectPMRegisterPatternCS	(	uint8_t	ipproto,
		AppProto	alproto,
		const char *	pattern,
		uint16_t	depth,
		uint16_t	offset,
		uint8_t	direction
	)

Registers a case-sensitive pattern for protocol detection.

Definition at line 1716 of file app-layer-detect-proto.c.

References SCEnter, and SCReturnInt.

Referenced by AppLayerParserRegisterProtocolParsers(), AppLayerProtoDetectUnittestCtxRestore(), DCERPCCleanup(), and SSLVersionToString().

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int AppLayerProtoDetectPMRegisterPatternCSwPP	(	uint8_t	ipproto,
		AppProto	alproto,
		const char *	pattern,
		uint16_t	depth,
		uint16_t	offset,
		uint8_t	direction,
		ProbingParserFPtr	PPFunc,
		uint16_t	pp_min_depth,
		uint16_t	pp_max_depth
	)

Definition at line 1729 of file app-layer-detect-proto.c.

References SCEnter, and SCReturnInt.

int AppLayerProtoDetectPPParseConfPorts	(	const char *	ipproto_name,
		uint8_t	ipproto,
		const char *	alproto_name,
		AppProto	alproto,
		uint16_t	min_depth,
		uint16_t	max_depth,
		ProbingParserFPtr	ProbingParserTs,
		ProbingParserFPtr	ProbingParserTc
	)

Return values

bool	0 if no config was found, 1 if config was found

Definition at line 1638 of file app-layer-detect-proto.c.

References AppLayerProtoDetectPPRegister(), ConfGetNode(), ConfNodeLookupChild(), SC_ERR_FATAL, SCEnter, SCLogDebug, SCLogError, SCReturnInt, STREAM_TOCLIENT, and ConfNode_::val.

Referenced by AppLayerRegisterProtocolDetection(), RegisterDNP3Parsers(), RegisterENIPTCPParsers(), RegisterENIPUDPParsers(), RegisterModbusParsers(), RegisterNFSTCPParsers(), RegisterNFSUDPParsers(), RegisterSMBParsers(), RegisterSSLParsers(), RegisterTemplateParsers(), and RegisterTFTPParsers().

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void AppLayerProtoDetectPPRegister	(	uint8_t	ipproto,
		const char *	portstr,
		AppProto	alproto,
		uint16_t	min_depth,
		uint16_t	max_depth,
		uint8_t	direction,
		ProbingParserFPtr	ProbingParser1,
		ProbingParserFPtr	ProbingParser2
	)

register parser at a port

Parameters

direction

STREAM_TOSERVER or STREAM_TOCLIENT for dp or sp

Definition at line 1604 of file app-layer-detect-proto.c.

References AppLayerProtoDetectCtx_::ctx_pp, DetectPortCleanupList(), DetectPortParse(), head, DetectPort_::next, DetectPort_::port, DetectPort_::port2, SCEnter, and SCReturn.

Referenced by AppLayerProtoDetectPPParseConfPorts(), AppLayerRegisterProtocolDetection(), RegisterDNP3Parsers(), RegisterENIPTCPParsers(), RegisterENIPUDPParsers(), RegisterModbusParsers(), RegisterNFSTCPParsers(), RegisterNFSUDPParsers(), RegisterSMBParsers(), RegisterSSLParsers(), RegisterTemplateParsers(), and RegisterTFTPParsers().

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int AppLayerProtoDetectPrepareState

(

void

)

Prepares the internal state for protocol detection. This needs to be called once all the patterns and probing parser ports have been registered.

Definition at line 1560 of file app-layer-detect-proto.c.

References AppLayerProtoDetectCtx_::ctx_ipp, AppLayerProtoDetectCtxIpproto_::ctx_pm, AppLayerProtoDetectCtx_::ctx_pp, FLOW_PROTO_DEFAULT, AppLayerProtoDetectPMCtx_::max_sig_id, SCEnter, SCLogDebugEnabled(), and SCReturnInt.

Referenced by AppLayerProtoDetectUnittestCtxRestore(), and AppLayerSetup().

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void AppLayerProtoDetectRegisterProtocol	(	AppProto	alproto,
		const char *	alproto_name
	)

Registers a protocol for protocol detection phase.

This is the first function to be called after calling the setup function, AppLayerProtoDetectSetup(), before calling any other app layer functions, AppLayerParser or AppLayerProtoDetect, alike. With this function you are associating/registering a string that can be used by users to write rules, i.e. you register the http protocol for protocol detection using AppLayerProtoDetectRegisterProtocol(ctx, ALPROTO_HTTP, "http"), following which you can write rules like - alert http any any -> any any (sid:1;) which basically matches on the HTTP protocol.

Parameters

alproto	The protocol.
alproto_str	The string to associate with the above "alproto". Please send a static string that won't be destroyed post making this call, since this function won't create a copy of the received argument.

Return values

0	On success; -1 On failure.

Definition at line 1819 of file app-layer-detect-proto.c.

References AppLayerProtoDetectProbingParserElement_::alproto, AppLayerProtoDetectCtx_::alproto_names, SCEnter, and SCReturn.

Referenced by AppLayerParserRegisterProtocolParsers(), AppLayerRegisterProtocolDetection(), RegisterDCERPCParsers(), RegisterDCERPCUDPParsers(), RegisterDNP3Parsers(), RegisterENIPTCPParsers(), RegisterENIPUDPParsers(), RegisterFTPParsers(), RegisterHTPParsers(), RegisterModbusParsers(), RegisterNFSTCPParsers(), RegisterNFSUDPParsers(), RegisterSMBParsers(), RegisterSMTPParsers(), RegisterSSHParsers(), RegisterSSLParsers(), RegisterTemplateParsers(), and RegisterTFTPParsers().

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void AppLayerProtoDetectReset

(

Flow *

)

Reset proto detect for flow.

Definition at line 1863 of file app-layer-detect-proto.c.

References Flow_::alparser, Flow_::alproto, Flow_::alproto_tc, Flow_::alproto_ts, ALPROTO_UNKNOWN, Flow_::alstate, AppLayerParserStateCleanup(), FLOW_RESET_PE_DONE, FLOW_RESET_PM_DONE, FLOW_RESET_PP_DONE, FlowUnsetChangeProtoFlag(), Flow_::probing_parser_toclient_alproto_masks, Flow_::probing_parser_toserver_alproto_masks, and STREAM_TOCLIENT.

Referenced by AppLayerHandleTCPData().

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int AppLayerProtoDetectSetup

(

void

)

The first function to be called. This initializes a global protocol detection context.

Return values

0	On succcess;
-1	On failure.

Definition at line 1758 of file app-layer-detect-proto.c.

References AppLayerExpectationSetup(), AppLayerProtoDetectCtx_::ctx_ipp, AppLayerProtoDetectCtxIpproto_::ctx_pm, FLOW_PROTO_DEFAULT, AppLayerProtoDetectPMCtx_::mpm_ctx, MpmInitCtx(), PatternMatchDefaultMatcher(), SC_ERR_FATAL, SCEnter, SCLogError, SCReturnInt, SinglePatternMatchDefaultMatcher(), AppLayerProtoDetectCtx_::spm_global_thread_ctx, and SpmInitGlobalThreadCtx().

Referenced by AppLayerProtoDetectUnittestCtxRestore(), AppLayerSetup(), and RegisterAllModules().

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void AppLayerProtoDetectSupportedAppProtocols

(

AppProto *

alprotos

)

Definition at line 2064 of file app-layer-detect-proto.c.

References AppLayerProtoDetectProbingParserElement_::alproto, ALPROTO_MAX, AppLayerProtoDetectCtx_::alproto_names, SCEnter, and SCReturn.

Referenced by AppLayerListSupportedProtocols(), AppLayerRegisterThreadCounters(), and AppLayerSetupCounters().

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void AppLayerProtoDetectSupportedIpprotos	(	AppProto	alproto,
		uint8_t *	ipprotos
	)

Definition at line 2031 of file app-layer-detect-proto.c.

References SCEnter, and SCReturn.

Referenced by SigMatchList2DataArray(), and SigMatchListSMBelongsTo().

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void AppLayerProtoDetectUnittestCtxBackup

(

void

)

Backs up the internal context used by the app layer proto detection module.

Definition at line 2112 of file app-layer-detect-proto.c.

References SCEnter, and SCReturn.

Referenced by AppLayerProtoDetectUnittestCtxRestore().

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void AppLayerProtoDetectUnittestCtxRestore

(

void

)

Restores back the internal context used by the app layer proto detection module, that was previously backed up by calling AppLayerProtoDetectUnittestCtxBackup().

Definition at line 2120 of file app-layer-detect-proto.c.

References AppLayerProtoDetectPMSignature_::alproto, ALPROTO_DCERPC, ALPROTO_FTP, ALPROTO_HTTP, ALPROTO_MAX, ALPROTO_SMB, AppLayerProtoDetectDeSetup(), AppLayerProtoDetectDestroyCtxThread(), AppLayerProtoDetectGetCtxThread(), AppLayerProtoDetectPMRegisterPatternCS(), AppLayerProtoDetectPrepareState(), AppLayerProtoDetectSetup(), AppLayerProtoDetectUnittestCtxBackup(), AppLayerProtoDetectUnittestCtxRestore(), AppLayerProtoDetectPMSignature_::cd, AppLayerProtoDetectCtx_::ctx_ipp, AppLayerProtoDetectCtxIpproto_::ctx_pm, FAIL_IF, FAIL_IF_NULL, FLOW_PROTO_TCP, FLOW_PROTO_UDP, FlowGetProtoMapping(), AppLayerProtoDetectPMCtx_::head, DetectContentData_::id, AppLayerProtoDetectPMCtx_::map, AppLayerProtoDetectPMCtx_::max_pat_id, AppLayerProtoDetectPMSignature_::next, PASS, Flow_::protomap, SCEnter, SCReturn, and STREAM_TOCLIENT.

Referenced by AppLayerProtoDetectUnittestCtxRestore().

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void AppLayerProtoDetectUnittestsRegister

(

void

)

Register unittests for app layer proto detection module.

Definition at line 3614 of file app-layer-detect-proto.c.

References SCEnter, SCReturn, and UtRegisterTest().

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void AppLayerRegisterExpectationProto	(	uint8_t	proto,
		AppProto	alproto
	)

Definition at line 2093 of file app-layer-detect-proto.c.

References AppLayerProtoDetectProbingParserElement_::alproto, proto, SC_ERR_NOT_SUPPORTED, and SCLogError.

Referenced by RegisterFTPParsers().

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void AppLayerRequestProtocolChange	(	Flow *	f,
		uint16_t	dp,
		AppProto	expect_proto
	)

request applayer to wrap up this protocol and rerun protocol detection.

When this is called, the old session is reset unconditionally. A 'detect/log' flush packet is generated for both direction before the reset, so allow for final detection and logging.

Parameters

f	flow to act on
dp	destination port to use in protocol detection. Set to 443 for start tls, set to the HTTP uri port for CONNECT and set to 0 to not use it.
expect_proto	expected protocol. AppLayer event will be set if detected protocol differs from this.

Definition at line 1843 of file app-layer-detect-proto.c.

References Flow_::alproto_expect, FlowSetChangeProtoFlag(), and Flow_::protodetect_dp.

Referenced by AppLayerRequestProtocolTLSUpgrade(), and HTPFreeConfig().

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void AppLayerRequestProtocolTLSUpgrade

(

Flow *

f

)

request applayer to wrap up this protocol and rerun protocol detection with expectation of TLS. Used by STARTTLS.

Sets detection port to 443 to make port based TLS detection work for SMTP, FTP etc as well.

Parameters

f	flow to act on

Definition at line 1858 of file app-layer-detect-proto.c.

References ALPROTO_TLS, and AppLayerRequestProtocolChange().

Referenced by SMTPProcessDataChunk().

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